# US 12,016,021 B2 · Reporting uplink control information in a random access procedure

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,016,021 B2
- Document ID: US12016021B2
- Status: Granted
- Kind: B2
- Application number: 16/821,728
- Filed: 2020-03-17
- Published: 2020-10-08
- Granted: 2024-06-18
- Earliest claimed: 2019-04-05
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Yisheng Xue; Xiaoxia Zhang; Sony Akkarakaran; Ozcan Ozturk; Jing Sun; Tao Luo; Linhai He
- Web page: https://patentgrep.com/patent/US12016021B2

## CPC

- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 74/004: {in the uplink, i.e. towards network}
- H04B 7/06952: {Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping}
- H04J 3/02: Details (electronic switching or gating H03K17/00)
- H04W 52/245: {taking into account received signal strength}
- H04W 52/365: {Power headroom reporting}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W 74/0836: with 2-step access
- H04W 74/0838: using contention-free random access [CFRA]
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)

## Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit an indication of a downlink beam in uplink control information of a random access message, wherein the downlink beam is different from a default beam corresponding to a preamble of the random access message and a random access occasion in which the random access message is transmitted, or wherein the downlink beam is selected from a set of multiple downlink beams corresponding to the random access occasion. The UE may monitor for at least one of a random access response or a downlink communication subsequent to the random access response using the downlink beam indicated in the uplink control information. Numerous other aspects are provided.

## Claims

### Claim 1

A method of wireless communication performed by a user equipment (UE), comprising:
transmitting, in a random access occasion and using a first set of resources, a first random access message, that is a first step of a two-step random access channel (RACH) procedure, comprising:
a first random access preamble identifier corresponding to a preamble of the first random access message, and
first uplink control information (UCI) comprising an indication of a downlink beam,
wherein the downlink beam is different from a default beam corresponding to the preamble of the first random access message and further to the random access occasion, or
wherein the downlink beam is selected from a set of multiple downlink beams corresponding to the random access occasion;
receiving, based at least in part on transmitting the first random access message, a first random access response comprising:
a second random access preamble identifier,
at least one of:
at least a portion of a second UCI, or
information identifying a second set of resources, and
an indication to fall back to a four-step RACH procedure;
transmitting a second random access message, of the four-step RACH procedure, based at least in part on:
the first random access preamble identifier matching the second random access preamble identifier, and
at least one of:
at least a portion of the first UCI matching the at least the portion of the second UCI, or
the first set of resources matching the second set of resources; and
receiving, using the downlink beam and based at least in part on transmitting the second random access message, a second random access response of the four-step RACH procedure.

### Claim 2 (depends on 1)

The method of claim 1, wherein each of a plurality of random access occasions configured for the UE corresponds to a single default beam, and wherein the downlink beam is different from the default beam corresponding to the random access occasion in which the first random access message is transmitted.

### Claim 3 (depends on 1)

The method of claim 1, wherein each of a plurality of random access occasions configured for the UE corresponds to multiple default beams, wherein the multiple default beams are each associated with a different set of preambles, and wherein the downlink beam is different from the default beam corresponding to the random access occasion in which the first random access message is transmitted and corresponding to the preamble of the first random access message.

### Claim 4 (depends on 1)

The method of claim 1, wherein the downlink beam is indicated using an index that identifies the downlink beam from the set of multiple downlink beams corresponding to the random access occasion.

### Claim 5 (depends on 1)

The method of claim 1, wherein a set of preambles is not partitioned among different downlink beams included in the set of multiple downlink beams.

### Claim 6 (depends on 1)

The method of claim 1, wherein the first random access response instructs the UE to use the downlink beam in association with the second random access response.

### Claim 7 (depends on 1)

The method of claim 1, further comprising:
monitoring for random access responses, including the first random access response and a third random access response, until an end of a random access response window,
wherein the third random access response comprises at least one of:
a third random access preamble identifier different from the first random access preamble identifier and the second random access preamble identifier, or
at least one of:
at least a portion of a third UCI different from the first UCI and the second UCI, or
information identifying a third set of resources different from the first set of resources and the second set of resources.

### Claim 8 (depends on 1)

The method of claim 1, wherein a random access radio network temporary identifier for the UE is based at least in part on the preamble of the first random access message and a physical uplink shared channel occasion in which the first random access message is transmitted.

### Claim 9 (depends on 1)

The method of claim 1, wherein the first random access response identifies at least one of a dedicated preamble or a dedicated random access occasion to be used by the UE for the second random access message.

### Claim 10 (depends on 1)

The method of claim 1, wherein the downlink beam is one of a plurality of downlink beams indicated in the UCI of the first random access message.

### Claim 11 (depends on 10)

The method of claim 10, wherein the first random access response indicates a set of downlink beams to be monitored by the UE and a time division multiplexing pattern indicated in system information.

### Claim 12 (depends on 1)

The method of claim 1, wherein the UCI further includes at least one of a power headroom report or a buffer status report.

### Claim 13

A method of wireless communication performed by a network entity, comprising:
receiving, in a random access occasion and using a first set of resources, a first random access message, that is a first step of a two-step random access channel (RACH) procedure, comprising:
a first random access preamble identifier corresponding to a preamble of the first random access message, and
first uplink control information (UCI) comprising an indication of a downlink beam,
wherein the downlink beam is different from a default beam corresponding to the preamble of the first random access message and further to the random access occasion, or
wherein the downlink beam is selected from a set of multiple downlink beams corresponding to the random access occasion;
transmitting, based at least in part on receiving the first random access message, a first random access response comprising:
a second random access preamble identifier,
at least one of:
at least a portion of a second UCI, or
information identifying a second set of resources, and
an indication to fall back to a four-step RACH procedure;
receiving a second random access message, of the four-step RACH procedure, based at least in part on:
the first random access preamble identifier matching the second random access preamble identifier, and
at least one of:
at least a portion of the first UCI matching the at least the portion of the second UCI, or
the first set of resources matching the second set of resources; and
transmitting, using the downlink beam and based at least in part on receiving the second random access message, a second random access response of the four-step RACH procedure.

### Claim 14 (depends on 13)

The method of claim 13, wherein each of a plurality of random access occasions corresponds to a single default beam, and wherein the downlink beam is different from the default beam corresponding to the random access occasion in which the first random access message is transmitted.

### Claim 15 (depends on 13)

The method of claim 13, wherein each of a plurality of random access occasions corresponds to multiple default beams, wherein the multiple default beams are each associated with a different set of preambles, and wherein the downlink beam is different from the default beam corresponding to the random access occasion in which the first random access message is transmitted and corresponding to the preamble of the first random access message.

### Claim 16 (depends on 13)

The method of claim 13, further comprising:
transmitting, during a random access response window, random access responses including the first random access response and a third random access response,
wherein the third random access response comprises at least one of:
a third random access preamble identifier different from the first random access preamble identifier and the second random access preamble identifier, or
at least one of:
at least a portion of a third UCI different from the first UCI and the second UCI, or
information identifying a third set of resources different from the first set of resources and the second set of resources.

### Claim 17

A user equipment (UE), comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
transmit, in a random access occasion and using a first set of resources, a first random access message, that is a first step of a two-step random access channel (RACH) procedure, comprising:
a first random access preamble identifier corresponding to a preamble of the first random access message, and
first uplink control information (UCI) comprising an indication of a downlink beam,
wherein the downlink beam is different from a default beam corresponding to the preamble of the first random access message and further to the random access occasion, or
wherein the downlink beam is selected from a set of multiple downlink beams corresponding to the random access occasion;
receive, based at least in part on transmitting the first random access message, a first random access response comprising:
a second random access preamble identifier,
at least one of:
at least a portion of a second UCI, or
information identifying a second set of resources, and
an indication to fall back to a four-step RACH procedure;
transmit a second random access message, of the four-step RACH procedure, based at least in part on:
the first random access preamble identifier matching the second random access preamble identifier, and
at least one of:
at least a portion of the first UCI matching the at least the portion of the second UCI, or
the first set of resources matching the second set of resources; and
receive, using the downlink beam and based at least in part on transmitting the second random access message, a second random access response of the four-step RACH procedure.

### Claim 18 (depends on 17)

The UE of claim 17, wherein each of a plurality of random access occasions configured for the UE corresponds to a single default beam, and wherein the downlink beam is different from the default beam corresponding to the random access occasion in which the first random access message is transmitted.

### Claim 19 (depends on 17)

The UE of claim 17, wherein each of a plurality of random access occasions configured for the UE corresponds to multiple default beams, wherein the multiple default beams are each associated with a different set of preambles, and wherein the downlink beam is different from the default beam corresponding to the random access occasion in which the first random access message is transmitted and corresponding to the preamble of the first random access message.

### Claim 20 (depends on 17)

The UE of claim 17, wherein the downlink beam is indicated using an index that identifies the downlink beam from the set of multiple downlink beams corresponding to the random access occasion.

### Claim 21 (depends on 17)

The UE of claim 17, wherein a set of preambles is not partitioned among different downlink beams included in the set of multiple downlink beams.

### Claim 22 (depends on 17)

The UE of claim 17, wherein the one or more processors are further configured to:
identify the downlink beam as a preferred downlink beam different from the default beam corresponding to the preamble of the first random access message and further to the random access occasion, and
wherein the first random access message is transmitted based at least in part on identifying the downlink beam as the preferred downlink beam.

### Claim 23 (depends on 17)

The UE of claim 17, wherein the one or more processors are further configured to:
identify the downlink beam, as a preferred downlink beam, from the set of multiple downlink beams corresponding to the random access occasion,
wherein the first random access message is transmitted based at least in part on identifying the downlink beam as the preferred downlink beam.

### Claim 24 (depends on 17)

The UE of claim 17, wherein the first random access response instructs the UE to use the downlink beam in association with the second random access response.

### Claim 25 (depends on 17)

The UE of claim 17, wherein the one or more processors are further configured to:
monitor for random access responses, including the first random access response and a third random access response, until an end of a random access response window,
wherein the third random access response comprises at least one of:
a third random access preamble identifier different from the first random access preamble identifier and the second random access preamble identifier, or
at least one of:
at least a portion of a third UCI different from the first UCI and the second UCI, or
information identifying a third set of resources different from the first set of resources and the second set of resources.

### Claim 26 (depends on 17)

The UE of claim 17, wherein the first random access response identifies at least one of a dedicated preamble or a dedicated random access occasion to be used by the UE for the second random access message.

### Claim 27

A network entity, comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
receive, in a random access occasion and using a first set of resources, a first random access message, that is a first step of a two-step random access channel (RACH) procedure, comprising:
a first random access preamble identifier corresponding to a preamble of the first random access message, and
first uplink control information (UCI) comprising an indication of a downlink beam,
wherein the downlink beam is different from a default beam corresponding to the preamble of the first random access message and further to the random access occasion, or
wherein the downlink beam is selected from a set of multiple downlink beams corresponding to the random access occasion;
transmit, based at least in part on transmitting the first random access message, a first random access response comprising:
a second random access preamble identifier,
at least one of:
at least a portion of a second UCI, or
information identifying a second set of resources, and
an indication to fall back to a four-step RACH procedure;
receive a second random access message, of the four-step RACH procedure, based at least in part on:
the first random access preamble identifier matching the second random access preamble identifier, and
at least one of:
at least a portion of the first UCI matching the at least the portion of the second UCI, or
the first set of resources matching the second set of resources; and
transmit, using the downlink beam and based at least in part on transmitting the second random access message, a second random access response of the four-step RACH procedure.

### Claim 28 (depends on 27)

The network entity of claim 27, wherein each of a plurality of random access occasions corresponds to a single default beam, and wherein the downlink beam is different from the default beam corresponding to the random access occasion in which the first random access message is transmitted.

### Claim 29 (depends on 27)

The network entity of claim 27, wherein the one or more processors are further configured to:
transmit, during a random access response window, random access responses including the first random access response and a third random access response,
wherein the third random access response comprises at least one of:
a third random access preamble identifier different from the first random access preamble identifier and the second random access preamble identifier, or
at least one of:
at least a portion of a third UCI different from the first UCI and the second UCI, or
information identifying a third set of resources different from the first set of resources and the second set of resources.